{"product_id":"4-mod-10-24-teeth-spur-gears-transmission-gear-pinion-thickness-35mm-45-steel","title":"4 Mod 10-24 Teeth Spur Gears Transmission Gear Pinion Thickness 35mm 45# Steel","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eMod 4 Spur Gears — Reliable Power Transmission for DIY Automation Projects\u003c\/h2\u003e\n    \u003cp\u003eWhen your motion-control build demands precise torque transfer without slippage or backlash surprises, choosing the right spur gear matters. These Mod 4 spur gears are engineered for makers, small-workshop builders, and engineering students who need a dependable, off-the-shelf gear that drops straight into their drivetrain without custom machining.\u003c\/p\u003e\n    \u003cp\u003eEach gear is machined from 45# medium-carbon steel — a material known for its balanced hardness and toughness — and features a 35 mm (≈1.38 in) face width. The module (pitch) is 4 mm, with tooth counts ranging from 10 T to 24 T, giving pitch circle diameters from approximately 40 mm (≈1.57 in) to 96 mm (≈3.78 in). Bore diameter and keyway dimensions vary by tooth count; see variant options for exact bore specs.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include DIY CNC router Z-axis drives, conveyor belt reduction stages, robotic arm joint transmissions, and educational gear-train demonstration rigs — anywhere a Mod 4 parallel-shaft spur gear is called for.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n    Compatible with any Mod 4 mating gear, rack, or pinion. Ensure shaft bore and keyway match your application before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Mod 4 Spur Gears\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003e45# Medium-Carbon Steel Construction\u003c\/strong\u003e — Offers a solid balance of tensile strength and machinability, suitable for moderate-to-heavy load transmission in Mod 4 spur gear applications.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n        \u003cstrong\u003e35 mm Face Width (≈1.38 in)\u003c\/strong\u003e — Wider face distributes tooth load across a larger contact area, reducing surface stress and extending service life compared to narrower pinions.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\n        \u003cstrong\u003e10 to 24 Tooth Range\u003c\/strong\u003e — Covers a broad gear-ratio selection in a single product family; mix and match tooth counts to achieve your target reduction or speed-up ratio.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eStandard Mod 4 Pitch\u003c\/strong\u003e — Fully interchangeable with any other Mod 4 spur gear, rack, or pinion on the market, simplifying replacement and system expansion.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlexible Pack Quantities (1 \/ 2 \/ 3 pcs)\u003c\/strong\u003e — Order a single gear for prototyping or multi-packs for production builds and spare-parts inventory, with per-unit savings on larger quantities.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\n        \u003cstrong\u003ePrecision-Machined Bore \u0026amp; Keyway\u003c\/strong\u003e — Each gear is bored and keyed to standard tolerances, enabling direct shaft mounting without additional machining in most DIY and light-industrial setups.\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Mod 4 Spur Gears\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eModule (Pitch)\u003c\/th\u003e\n\u003ctd\u003e4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eTooth Count Range\u003c\/th\u003e\n\u003ctd\u003e10 T – 24 T (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFace Width\u003c\/th\u003e\n\u003ctd\u003e35 mm (≈1.38 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePitch Circle Diameter\u003c\/th\u003e\n\u003ctd\u003e40 mm – 96 mm (≈1.57 – 3.78 in), varies by tooth count\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e45# Medium-Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Angle\u003c\/th\u003e\n\u003ctd\u003e20°\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBore Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eKeyway\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 pcs \/ 2 pcs \/ 3 pcs (choose above)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right tooth count for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe gear ratio between two meshing Mod 4 spur gears equals the ratio of their tooth counts. For example, pairing a 10 T pinion with a 20 T gear gives a 2:1 reduction. Decide your desired input\/output speed ratio first, then select tooth counts that achieve it while keeping both gears within your available center-distance envelope. The pitch circle diameter is simply Module × Teeth (e.g., 4 × 15 = 60 mm PCD).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat load can these Mod 4 spur gears handle?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# steel has a typical tensile strength of approximately 600–800 MPa. Actual load capacity depends on tooth count, face width, operating speed, and lubrication. The 35 mm face width provides a good load-distribution area for light-to-moderate industrial and DIY automation loads. For heavy-duty or high-cycle applications, consult a gear-strength calculation (Lewis equation or AGMA standard) using your specific operating parameters.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these gears corrosion-resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a light machine oil or grease coating during storage and operation. If your application requires corrosion resistance, consider pairing these gears with a protective coating or selecting a stainless-steel alternative for the exposed components.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these gears mesh with my existing Mod 4 rack or pinion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — any two gears with the same module and pressure angle will mesh correctly. These gears use a standard 20° pressure angle and Mod 4 pitch, so they are fully compatible with any other Mod 4 \/ 20° spur gear, rack, or pinion regardless of brand. Verify center distance: C = (PCD₁ + PCD₂) \/ 2.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat bore diameter and keyway size do these gears have?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBore diameter and keyway dimensions vary by tooth count (and therefore by gear size). Please refer to the variant detail page or contact us to confirm the exact bore and keyway specifications for the specific tooth count you need before ordering, to ensure compatibility with your shaft.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eShould I order 1, 2, or 3 pcs?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eOrder 1 pc for prototyping or single-axis builds. Choose 2 pcs when you need a matched pair (e.g., two identical gears on parallel shafts) or want a spare on hand. The 3-pcs pack offers the best per-unit value and is ideal for production runs, classroom kits, or multi-axis machines where the same gear size is used in several locations.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo these gears require lubrication?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Like all steel spur gears, these benefit from regular lubrication to reduce friction, wear, and noise. Apply a light gear grease or machine oil to the tooth flanks before first use and re-lubricate periodically based on your duty cycle. Enclosed gearboxes can use an oil bath; open drives should use a grease that resists flinging off at operating speed.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your model (tooth count) and packing quantity above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"4M 10T \/ 1 pcs","offer_id":52443227128082,"sku":"GLFBFHHGLBZSJ058241x1","price":35.47,"currency_code":"USD","in_stock":true},{"title":"4M 11T \/ 1 pcs","offer_id":52443227160850,"sku":"GLFBFHHGLBZSJ058242x1","price":43.64,"currency_code":"USD","in_stock":true},{"title":"4M 12T \/ 1 pcs","offer_id":52443227193618,"sku":"GLFBFHHGLBZSJ058243x1","price":59.36,"currency_code":"USD","in_stock":true},{"title":"4M 13T \/ 1 pcs","offer_id":52443227226386,"sku":"GLFBFHHGLBZSJ058244x1","price":67.82,"currency_code":"USD","in_stock":true},{"title":"4M 14T \/ 1 pcs","offer_id":52443227259154,"sku":"GLFBFHHGLBZSJ058245x1","price":86.92,"currency_code":"USD","in_stock":true},{"title":"4M 15T \/ 1 pcs","offer_id":52443227291922,"sku":"GLFBFHHGLBZSJ058246x1","price":96.42,"currency_code":"USD","in_stock":true},{"title":"4M 16T \/ 1 pcs","offer_id":52443227324690,"sku":"GLFBFHHGLBZSJ058247x1","price":104.92,"currency_code":"USD","in_stock":true},{"title":"4M 17T \/ 1 pcs","offer_id":52443227357458,"sku":"GLFBFHHGLBZSJ058248x1","price":114.72,"currency_code":"USD","in_stock":true},{"title":"4M 18T \/ 1 pcs","offer_id":52443227390226,"sku":"GLFBFHHGLBZSJ058249x1","price":143.32,"currency_code":"USD","in_stock":true},{"title":"4M 19T \/ 1 pcs","offer_id":52443227422994,"sku":"GLFBFHHGLBZSJ058250x1","price":160.13,"currency_code":"USD","in_stock":true},{"title":"4M 20T \/ 1 pcs","offer_id":52443227455762,"sku":"GLFBFHHGLBZSJ058251x1","price":157.94,"currency_code":"USD","in_stock":true},{"title":"4M 21T \/ 1 pcs","offer_id":52443227488530,"sku":"GLFBFHHGLBZSJ058252x1","price":194.72,"currency_code":"USD","in_stock":true},{"title":"4M 22T \/ 1 pcs","offer_id":52443227521298,"sku":"GLFBFHHGLBZSJ058253x1","price":204.35,"currency_code":"USD","in_stock":true},{"title":"4M 23T \/ 1 pcs","offer_id":52443227554066,"sku":"GLFBFHHGLBZSJ058254x1","price":211.15,"currency_code":"USD","in_stock":true},{"title":"4M 24T \/ 1 pcs","offer_id":52443227586834,"sku":"GLFBFHHGLBZSJ058255x1","price":217.18,"currency_code":"USD","in_stock":true},{"title":"4M 10T \/ 2 pcs","offer_id":52443227619602,"sku":"GLFBFHHGLBZSJ058241x2","price":78.42,"currency_code":"USD","in_stock":true},{"title":"4M 11T \/ 2 pcs","offer_id":52443227652370,"sku":"GLFBFHHGLBZSJ058242x2","price":97.29,"currency_code":"USD","in_stock":true},{"title":"4M 12T \/ 2 pcs","offer_id":52443227685138,"sku":"GLFBFHHGLBZSJ058243x2","price":116.48,"currency_code":"USD","in_stock":true},{"title":"4M 13T \/ 2 pcs","offer_id":52443227717906,"sku":"GLFBFHHGLBZSJ058244x2","price":133.39,"currency_code":"USD","in_stock":true},{"title":"4M 14T \/ 2 pcs","offer_id":52443227750674,"sku":"GLFBFHHGLBZSJ058245x2","price":171.58,"currency_code":"USD","in_stock":true},{"title":"4M 15T \/ 2 pcs","offer_id":52443227783442,"sku":"GLFBFHHGLBZSJ058246x2","price":190.59,"currency_code":"USD","in_stock":true},{"title":"4M 16T \/ 2 pcs","offer_id":52443227816210,"sku":"GLFBFHHGLBZSJ058247x2","price":207.59,"currency_code":"USD","in_stock":true},{"title":"4M 10T \/ 3 pcs","offer_id":52443227848978,"sku":"GLFBFHHGLBZSJ058241x3","price":116.5,"currency_code":"USD","in_stock":true},{"title":"4M 11T \/ 3 pcs","offer_id":52443227881746,"sku":"GLFBFHHGLBZSJ058242x3","price":144.81,"currency_code":"USD","in_stock":true},{"title":"4M 12T \/ 3 pcs","offer_id":52443227914514,"sku":"GLFBFHHGLBZSJ058243x3","price":173.59,"currency_code":"USD","in_stock":true},{"title":"4M 13T \/ 3 pcs","offer_id":52443227947282,"sku":"GLFBFHHGLBZSJ058244x3","price":198.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-03_7bc1fcd1-ed39-4758-9bee-9316c74f8506.jpg?v=1784025091","url":"https:\/\/homediyer.com\/products\/4-mod-10-24-teeth-spur-gears-transmission-gear-pinion-thickness-35mm-45-steel","provider":"HomeDIYer","version":"1.0","type":"link"}